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. M. McEWEN.

FAN. APPLICATION FILED FEB. 24; l9l9.

Patented Sept. 23, 1919.

WILLARD M. McEWE-N, OF CHICAGO, ILLINOIS.

FAN.

Specification of Letters Patent.

Patented Sept. 23, 1919.

Application filed February 24, 1919. Serial No. 278,820.

To all whom it may concern:

Be it known that I, WILLARD M. Mo- EWEN, a citizen of the United States of America, and a resident of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Fans, of which the following is a specification.

This invention relates to mechanism for utilizing gyratory forces set up through the tilting of the axis of a rotating member and thereby causing movement about a transverse axis, and has particular reference to electric fans wherein it is desirable to periodically change the direction of the air c1'1rrents produced by said fan.

The main objects of this invention are to provide improved mechanism for causing an electric fan to sweep from side to side with a wavelike motion; and to provide improved, simple, and inexpensive means for utilizing in the operation of an electric fan the gyrat'ory principles described in my Patent No. 1,214,198 of January 30, 1917.

A specific embodiment of this invention is shown in the accompanying drawings, in which-- Figure 1 is a side elevation, partly in section, of an electric fan constructed in accordance with my new design.

Fig. 2 is a section of the same taken on the line 2-2 of Fig. 1.

In the form shown in the drawings, the fan comprises the usual electric motor frame 1 with a rotor 2 journaled therein on a horizontal axis and with a fan 3 of the impeller type mounted directly upon the motor shaft 41. The base 5 of the motor frame is mounted by means of a ball-bearing 6 upon a carrier 7 for rotation about a vertical axis relative to said carrier, and is secured against accidental dislodgment by means of a central stud 8.

The carrier 7 may be described as a truncated segment of a cylinder or collar, having its upper and lower faces inclined with respect to each other. The lower face of the collar 7 is carried by ball-bearings 9 upon the top of the stationary base 10. and is prevented from being dislodged therefrom by means of a central tubular stud 11 and nut 12.

In order that the motor frame may be tilted relative to the base to cause the fan to sweep up and down, the carrier 7 is rotrated, because they do not form a part of the present invention, which is directed to the mechanism for producing a wave motion of the fan, and said connectlons may be any of the well-known devices for conducting an electric current between relatively rotatable parts. v

v The operation of the device shown is as follows: When the motor is in operation, the gear causes the carrier 7 to rotate with respect to the motor frame and inasmuch as the end surfaces of the carrier are disposed at an angle to each other, this rotation causes the motor frame to tiltwith respect to the base 10, thereby causing the fan to oscillate in a vertical plane. In accordance with a well-known principle ofphysics, when a heavy rotating mass, such as the rotor of the motor and the fan, is caused to tilt so as to change the angular disposition of the axis thereof in space, gyroscopic forces are set up, which tend to cause the axis to simultaneously shift to one side or the other, ac-

- cording to the direction in which the fan is tilted. For example, when the fan is tilted upward, the gyroscopic forces cause the motor frame to swing toward one side, and when the fan is tilted downward, the gyroscopic forces cause the fan to swing toward the opposite side, the sidewise swinging in one direction continuing a short time after the fan has begun to tilt back and until the gyratory forces due to the reversed tilting have overcome the momentum of the movement of the mass in the first direction. Thus, it will be seen that the angular disposition of the upper and lower faces of the carrier 7 and the speed at which said carrier is driven by the gearing may be so proportioned in the design of the apparatus as to cause any desired degree of sidewlse rotation of the motor frame, and that it may be more or less than 360. In other words, the sidewise sweep of the fan in one direction before it is reversed may be less than a complete revolution or may be several complete revolutions, according to the choice of the bases and connected therewith respectively; on axesuinclined to each other, and mechanism,.for rotating said carrier relative to one of said bases whereby; the rotation of said-carrier will tilt one of said bases rela-- Although but one specific embodimentof this invention has been herein shown and described, it will be understood that numerous t details of the construction shown may be" altered or omitted without departing from definedby the u forces set upby the tilting of said motor.

the spirit of this invention as following claims.

I claim:

- 1-. A mechanism for causing oscillation in one .plane through tilting a rotating member in a different plane,.oomprising a motor- :drivenv menrber, a carrierl supporting said member for rotation onan axis at an angle tow he axis of rotation of said member, a base supporting said carrier' for rotation on an' axis inclined .to .the axis ofjrotation' of said member .on said carrier, andamechanism for rotatlng said carrier about one of-its said-axes.

2.:,A- motorrdriven fan, a relatively sta{ tionary base supporting said-fan, a second base supporting said firstnamed base,a rotatable' carrier interposed between, said tive to-thegother.

frame supporting said motor, a carrier supporting said, frame for rotation on an axis 3. A fan having a rotatable motor and a;

er -1919.; transverse to the axisof sa1dmotor,'a base, Y

tating said carrier relative to said frame whereby said fan will be tilted relative tosaid base and will oscillate about the axis of; said carrier through'the action of gyratory 4. An electric fan, comprising a motor,

frame, a motor mounted therein, a supporting base separate from saidmoto'r frame, a

truncated carrier interposed between said motor framefand base and having, its relativelyihclined end faces rotatably mounted withrespect to said frame and baseresplec- --tively, and mechanism housed. within said frame and carrier and connecting said car- :rier' with said motor whereby said carrier is caused to rotate relative'to said frame.

' 5. An electric fan, comprising a 'motor' frame, a motor mountedtherein, a supportingbase separate from said motor frame, a truncated/carrierinterposedbetween said 7 -motor frame and base and having its relatively inclined end faces rotatab-ly mounted withfrespect to' said frame and base respec- ":tively', an internal gear on said carrier,and a pinion -meshingutherewith. and having -worm and wheel connection with the shaft of said motor for rotating said carrier relativeto said frame; "Signed at Chicago this 20th dayofFebruj i .Washington, D. 0.; v

TWILLARD M.

I copies o t this potent may beiobtained for five cents each, by addressing the Commissioner otratnts, 

